Hi,
We currently have a pair of Juniper EX4200-48T (JunOS 12.3R12.4) running as separate Core LAN Switches, not stacked. They’re both configured essentially the same except for different IP / VRRP addresses. They have the Default routing-instance plus an additional routing-instance named Corporate and is of type virtual-router. The Default routing-instance has one RVI and a static default route. The Corporate routing-instance has several RVIs and is running OSPF plus a different static default route.
We have encountered an odd, intermittent problem in which some packets arriving on a Corporate VLAN that should be exiting on a different Corporate VLAN (IP route exists) are actually exiting the 4200 through the RVI/VLAN in the Default routing-instance..
To further confuse this, the packet source MAC address DOES NOT CHANGE as it transits the switch. The destination MAC address changes to the default router’s MAC address for the Default routing-instance. As expected the source and destination IP addresses do not change through the switch.
We have Wiresharked the ingress and egress interfaces and this is definitely happening within the EX4200. It appears that the packet is “leaking” to the wrong routing-instance VLAN.
Has anyone seen this before or have any ideas what could be causing this?
Thank you for your time. Larry